Luminary and modular unit lighting fixture therefor



R. A. LANGER Nov. 16, 1965 LUMINARY AND MODULAR UNIT LIGHTING FIXTURETHEREFOR 3 Sheets-Sheet 1 Filed June 28, 1963 FIG.7

INVENTOZQ. Robert A. Langer BY ATTORNEY Nov. 16, 1965 R. A. LANGER3,218,446

LUMINARY AND MODULAR UNIT LIGHTING FIXTURE THEREFOR Filed June 28, 1963s Sheets-Sheet 2 ,INVENTOR.

Roberf A. Lang? ATTORNEY Nov. 16, 1965 R. A. LANGER 3,218,446

LUMINARY AND MODULAR UNIT LIGHTING FIXTURE THEREFOR Filed June 28, 19633 Sheets-Sheet 3 United States Patent 3,218,446 LUMINARY AND; MODULARUNIT LIGHTING FIXTURE THEREFOR Robert A. Langer, Glenbrook, Conn,assignor to New York Worlds Fair 1964-1965 Corporation, Flushing MeadowPark, Flushing, N.Y., a corporation Filed June 28, 1963, Ser. No.291,535 7 Claims. (Cl. 240-3) This invention relates in general to aluminary and a modular lighting fixture therefor, and more specificallyto a luminary composed of a plurality of modular unit lighting fixturesconstructed and arranged so that the size and shape of the luminary canbe varied by adding or subtracting the number of modular unit fixturesrequired for a given luminary arrangement.

In the present day and age, many businesses or enterprises, as forexample, shopping centers, fairs, exhibits, drive-in movies, sportarenas or events, country theatres, public resorts and the like, mustprovide relatively large areas for the parking of the patronsautomobiles. Heretofore, difiiculty has been encountered providingadequate means for identifying portions of such expansive parking areasand/ or directing the patrons who for the most part, are thoroughlyunfamiliar with the local surroundings to other areas of interest ofsuch enterprises. All too often in such large public parking areas,little if any real noticeable identification markers or beacons areprovided. As a result, when one parks his car in such a vast parking lotto attend the function or event offered by the enterprise, a patron willfrequently forget in which area or portion of the lot the car has beenparked. Consequently, when returning to his car, he frequently cannotimmediately locate its position inasmuch as the noted landmarks, as forexample, adjacent cars, may have been moved. For this reason, a personwill lose a great deal of time in attempting to orientate his positionin order to find where he has parked his car.

Also, in many resort areas and other outdoor interests, e.g'., fairs,exhibits and the like, where many of the patrons are visiting, little ifany effort has been made to provide informative visual aids fordirecting patrons to the various points of interest, which can alsofunction to light the way at night. Consequently, in the absence of anyorganized manner of providing visual direction to patrons patronizingsuch events or to given points of interest, much of the enjoyment ofsuch events is lost because much time is lost in meaningless, tiringwandering.

Therefore, it is an object of this invention to provide an improvedluminary construction which can be readily utilized as a visible beaconfor directing persons to given areas of interest or to particular areasof a vast parking lot to help orientate the person unfamiliar with thesurroundings.

Another object of this invention is to provide a unique luminary inwhich the size or shape thereof can be readily varied to accommodate agiven situation.

Another object of this invention is to provide a luminary Which iscomprised of a plurality of unit modular fixtures which can be clusteredin various arrangements to define readily distinct luminousconfigurations which are pleasing, colorful and decorative.

It is another object of this invention to provide a modular unitlighting fixture having a light source universally mounted therein sothat the light beam can be directed in any direction.

Still another object of this invention is to provide a luminaryconstructed of a cluster of similarly constructed unit lighting fixtureswhich are assembled atop of an elongated supporting hole and which isrugged, rigid and capable of resisting elements of Weather.

Still another object of this invention is to provide a modular unitlighting fixture that is both weather tight and light tight.

It is another object of this invention to provide a 1umi nary capable ofilluminating a considerable area in all directions.

Still another object is to provide a luminary of modular unitconstruction which is relatively simple, which can be easily fabricatedand assembled, and which is positive in operation.

Another object is to provide a luminary constructed of a cluster ofindividually connected modular units of similar constructions, each ofwhich is adapted to contain its own light source with means forindividually adjusting position of the respective light sources relativeto one another.

Another object is to provide a novel luminary having a fixture ofmodular design whereby the size and shape of a given luminary can bevaried by adding or subtracting modular units as desired.

It is another object of this invention to provide anovel lamp holder forsupporting a lamp in a given modular unit and which is of minimum sizeso as to not cast any shadow.

It is another object of this invention to provide a novel cubiclemodular unit the sides thereof are formed of translucent, readilyreplaceable or removable panels. I

It is another object of this invention to provide a luminary formed of aseries of modular unit lighting fixtures and having provisions forincorporating therein a loud speaker of a public address system.

The above objects, and other features and advantages are readilyattained by a luminary comprising essentially of an elongated supportingmeans which has. fixed atop thereof a core frame to which .a cluster oflighting fixtures, each being similarly constructed as a modular unit.In accordance with this invention, each of the respective modular unitsare defined by an open cubic frame construction comprising essentiallyof a top and bottom rectangular frame member which are secured at thecorners thereof by an angular corner piece. Means are provided fordetachably mounting translucent panels between adjacent corner pieces toclose the open sides of the cubic framed fixture. Also top and bottompanels may define the top and bottom of the cubic frame. Accordingly,the colors of the respective panels may be varied in accordance to agiven scheme. Means are pro vided for readily attaching the respectivecubic lighting fixture in side by side relationship to define anydesired cluster or array of such units about the core frame. Each of themodular units is further provided with means for universally supportingtherein a light source. Accordingly, the position and direction of thelight rays beaming from the respective light sources can beindependently adjusted relative to one another. If desired, means arefurther provided to include in the illuminary a loudspeaker of a publicaddress system so as to provide an audible implement to the visuallighting information rendered possible by the particular constructionand the arrangement of the clustered fixtures.

A feature of this invention resides in the provision that the respectivemodular unit construction of the respective light fixtures can bearrayed in clusters to form an illuminary any desired size, shape orappearance.

Another feature of this invention resides in the novel cubical frameunit construction of the respective lighting fixtures.

Another feature of this invention resides in the provision that therespective panels of the luminary can be colored in accordance to agiven scheme so as to func- (3 tion as a beacon for directing patrons ofa given attraction to a particular area or point of interest.

Another feature of this invention resides in the provision that theinstant luminary is relatively simple in construction, is readilyfabricated of relatively simple structural components, and which can bereadily assembled and disassembled with a minimum of effort.

Other features and advantages will become more readily apparent whenconsidered in view of the drawings and specifications in which,

FIGURE 1 illustrates a perspective view of the luminary constructed andarranged in accordance with the instant invention.

FIGURE 2 is a perspective exploded view illustrating the luminary of theinstant invention.

FIGURE 3 is a sectional view in elevation taken through one of themodular units which comprise the luminary of the instant invention.

FIGURE 4 is a sectional view taken through a modular unit constructionalong line 44 of FIG. 3.

FIGURE 5 is a detailed section view taken through line 5-5 of a cornerend piece on FIG. 3.

FIGURE 6 is a detail elevation view of FIG. 5 and FIGURE 7 includes aseries of diagrammatical illustrations only a few of the variations ofluminary possible by the instant luminary construction.

Referring to the drawings, and in particular to FIGS. 1 and 2, theluminary 10 of the instant invention comprises essentially of anelongated support means or pole 11, a central core unit or frame 12,connected to the end of a transition section 13 secured atop the pole,and a plurality of modular unit lighting fixtures 14 which are arrayedin a cluster of any desired size or configuration about the central coreor frame structure 12 and each other.

As shown, the supporting means or pole 11 comprises a pole of anysuitable material and/or shape which may be for example, 20 ft. long.The pole 11 may be imbedded in the ground, but preferably it issupported or mounted in a concrete pedestal (not shown). The centralcoreor frame structure 12 and transition section 13 are mounted atop thepole 11 by a slip fitter or collar and it provides the support for eachof the respective individual modular unit lighting fixtures 14 as willbe hereinafter described. The transition section 13 is defined bystructural angle ,member 13A extending upwardly and outwardly from theslip fitter 15 and a covering panel 16 is connected to adjacent members13A to define the closures for the section.

The core frame 12 connected to the top of the transition sectionprovides the mounting or support for each of the respective modular unit14 or lighting fixtures and also as a resonance cavity for a loudspeaker 25. Essentially the central core frame 12 consists of an opencubical frame structure approximately 16" x 16" x 18". Essentially thecore frame 12 comprises a top rectangular disposed frame member 12A anda bottom rectangularly disposed frame member 12B which areinterconnected at the corners thereof in spaced relationship by aplurality of corner end pieces 12C. As shown, each of the corner andpieces 12C are defined by an elongated angle member, which has itsflanged portions 17, 18 disposed at substantially right angles withrespect to each other. Suitable fastening means are provided as forexample, screw means or the like to secure the respective end cornerpieces 12C between the top and bottom frame members 12A, 12B of the coreunit 12. The bottom panel 19 connected to the bottom frame 12B isprovided with a circular cut out portion 20. Side panels 21 are securedto the vertical sides of the core frame unit 12 and connected to theinside of the respective side panels 21 are the ballast 22 for the lamps23 disposed within the respective modular light fixture 14. Weld boltsare utilized to attach the ballast 22 for operating the respectivelighting units to the side panels. Terminal strips are provided for theprimary wires of the ballast. Preferably the terminal strips aresymmetrically located within the ballast 22. A sheet metal cover .plate24 closes the top of the core frame unit 12. Preferably, the cover 24 isremovably connected to the horizontal flanges of the top frame member bysuitable fasteners, and thereby provides means for defining a readyaccess for servicing the interior components disposed within the coreframe 12. A suitable gasket means may be interposed between the sheetmetal cover plate 24 and the upper frame 12A of the core unit 12 so asto provide a weather tight seal. Such gasket means may comprise a foamrubber gasket or the like.

If desired, a loud speaker 25 of a public address system may be mountedwithin the transition section between the top of the pole and thecentral core unit of the luminary. Accordingly the sides 16 of thetransition section 13 may define a perforated grill panel or the like asshown. Preferably the grill or sides 16 is secured by means of screwfasteners or the like so as to be rendered readily removable.

In order to provide means for the connections of the respective modularunit light fixtures 14 to the core frame 12 to be hereinafter described,the corner pieces 12C of the central core frame are each provided with aplurality of apertures 26 for receiving the fastening means by which theadjacent modular unit light fixture 14 may be detachably connectedthereto.

As shown in FIGS. 1 and 2, a plurality of individually constructedmodular lighting fixtures 14 can be detachably secured to the respectivefaces of the central core unit 12. In the illustrated embodiment, eachof the individual modular unit lighting fixtures 14 are illustrated asbeing of cubical construction, preferably having a physical dimension ofapproximately 16" x 16" x 16". Essentially each of the respectivemodular unit constructions are similar in construction and therefore thedescription of one is considered sufficient for disclosure andunderstanding of the concept.

Essentially the modular unit light fixture 14 comprises a die cast topand bottom member 27, 28 respectively, each of which is defined byopposed side and end portions rectangularly disposed. The respectiveside and end portions of the top and bottom frame 27, 28 are formed ofstructural angle members having a horizontally extending flange portionand a connected vertically disposed flange portion. The respective topand bottom rectangmlar frame members 27, 28 of the unit are connected inspaced relationship by a plurality of corner pieces 29 of angularconstruction. Preferably each of the corner pieces 29 are formed of anextruded aluminum. Suitable screw type fasteners or the like 30 securethe respective top and bottom frame portions 27, 28 to the respectivecorner pieces. Thus, it will be apparent that an open cubic structure isformed to define the frame of the modular unit 14.

As best seen in FIGS. 4 and 5, the extruded corner pieces are providedwith flange portions 29A, 29B disposed at right angles with respect toeach other, and the respective flange portions 29A, 29B have formed inthe free end thereof a groove 31 extending substantially c0- extensiveto the length of the corner piece 29. Also, the interior surface of therespective flange portions 29A, 29B of the corner pieces 29 have formedtherein a groove extending the length thereof to define a slideway 32for receiving an angle slide 33 for reason which will. be hereinafterdescribed. The arrangement is such that the respective slides 33 can berendered adjustably disposed along the length of the respective cornerpiece 29.

As shown in FIGS. 4 and 5, a readily removable side panel 34 is retainedin the grooves 31 of adjacent corner pieces. When the modular units arearrayed in a cluster, the exposed exterior faces of the respectivemodular unit lighting fixtures only are preferably closed by atranslucent panel 34. Thus the faces of the cubes. within the.

cluster may not be provided with panels 34, thereby permitting light tobe diffused throughout the entire cluster.

The translucent panels 34 may be formed of any desired color.Accordingly, the translucent panels 34 preferably have the combinedproperties of a high level light reflectance for maximum production of acolorful daylight eifect, and also a high degree of light transmittancefor equally colorful nighttime appearance when used in atrans-illuminated manner with a cool white fluorescent light source. Forexample, panels 34 may be translucent cast acrylic resin, Plexiglas typeG, as manufactured by the Rohm and Haas Company. Because the modularunit construction is applied for outdoor use, it is essential that thetranslucent material have a sufficient strength to Withstand windpressure and other elements of weather.

In accordance with this invention, the arrangement is such that the unitmodular construction 14 described can be detachably connected to thecentral core 12 frame or to each other in side by side relationship. Asshown in FIG. 2, the corner pieces 29 of the modular unit constructionare provided with a pair of apertures or holes 35 which are adapted tobe disposed in alignment with corresponding holes or apertures 26 formedin the corner pieces of the core frame unit, or with holes 35 of anadjoining unit 14. By merely inserting a suitable fastener in thealigned holes 26, 35, a respective modular light fixture 14 can besecurely attached to the central core frame 12 of the unit. Therefore,it will be readily apparent that the respective size and shape of theluminary can be readily built up as required by attaching severalmodular unit constructions to the central core frame 12 and/or to eachother as may be desired.

In FIG. 1, eight modular core units 14 are disposed about the centralcore 12 frame. While FIG. 1 illustrates merely a single bank of modularunit lamp fixtures 14 circumscribing a central core 12 of the luminary,it is to be noted that a second bank of modular unit constructions (notshown) may be connected above the bank illustrated. Also, luminaries ofvarious other arrangements and configurations can be constructed withthe modular unit light fixture 14 described. For example, FIG. 7illustrates several arrangements in which the respective modular unitconstructions 14 can be connected about a central frame core 12 and toeach other. In these views the central core 12 is identified by an Xlocated at the center of the luminary. The other squares signify typicalmodular unit constructions 14 of the type hereinabove described.

In accordance with this invention, it will be noted that the top of theuppermost bank of modular units 14 of the luminary may be covered by asheet metal cover 37. To render the cover weather tight and light tight,a suitable gasket 38 is interposed between the top cover sheet 37 andthe top member 27 of the cubic frame structure. A bottom panel 39 forclosing the open area of the bottom piece 28 is positioned on thehorizontal flanges thereof. In accordance with this invention suitable Lshaped brackets 40 securely fastened to the vertical flange of thebottom member 28 maintains panel 39 in position thereon. In thearrangement of a luminary, as disclosed in FIG. 1, the bottom panels 39of the respective modular unit lighting fixtures 14 are formed of apattern clear plastic or the like for maximum diffusion of the light ina downward direction.

In accordance with this invention, each of the respective modular unitlighting fixtures of the luminary may be provided with an independentsource of light 41. As shown in FIGS. 2, 3 and 4, the light sourcecomprises a rectangular panel type fluorescent lamp or bulb 41. The lamp41 is supported in its respective fixture so as to be universallyadjusted therein so that its light beam may be directed in any givendirection. The mount for the individual lamp 41 comprises a lamp holder42 which is defined as a wire ring arranged to circumscribe thecircumference of the lamp or bulb 41. As shown in FIG. 4,

the respective corner portions of the lamp holder 41 are provided withan eye loop 42A for receiving one end of a coil spring 43 to support thelamp from the respective slides 33, which are slidably adjusted alongthe slideways 32 formed in the respective corner pieces 29 of themodular unit construction 14. Corner brackets 44 secure the lamp 41 tothe wire ring lamp holder 42. Thus, it will be noted that the lamp 41 isresiliently mounted by the four coil springs 33 disposed at each of therespective corners of the lamp holder 42. By adjustably positioning therespective slides 33 connected to the other end of the coil spring 43along the slideway 32, the position of the lamp 41 can be varied in anydesired manner so that the light rays thereof may be directed out of anyof the respective sides of the modular unit construction 14.

From the foregoing description of the individual modular unit 14, itwill be apparent that each of the lamp bulbs 41 of the luminary may bedirected in a different angular direction as may be desired. To securethe position of the lamp 41 in its adjusted position, a set screw 45 isthreaded through the slide 33 as noted in FIG. 6 and 5. Merely bythreading the screw 43 into the slide 33, it will frictionally securethe slide 33 in its adjusted position.

From the foregoing description, it is to be noted that luminaries ofvarious sizes, shapes and configurations can be formed with the modularunit construction described. Thus, the luminary may take on verydistinctive shapes and sizes so that each is rendered distinctive,

one from another. Also, the particular luminary construction 16described renders it possible, by the utilization of various colors in aparticular color scheme, to be adapted for use as beacons or markers todirect patrons to a given area of interest. Also, a public addresssystem can be readily incorporated in the luminary with a minimum ofease to provide for audible information to be dissimilated.

From the foregoing description, it will be readily apparent that theluminary described is relatively simple in construction, distinctive inarrangement, and positive in operation. It is rugged, stable andresistant to the elements of weather. Also, that by rendering the lightsource 41 individually adjustable in each of the respective modularlight fixture units, the rays of light from a single luminary can besimultaneously beamed in various directions to illuminate desired areas.The particular luminary is further conducive for lighting streets andareas while at the same time supply visible information capable offunctioning as beacons for directing persons to desired locations orpoints of interest.

While the instant invention has been described in detail with referenceto a particular embodiment thereof, it is to be understood thatvariations and modifications thereof may be made without departing fromthe spirit or scope of the invention.

What is claimed is:

1. A modular illuminating fixture comprising,

(a) a frame structure including,

(b) a top piece,

(c) a bottom piece,

(d) and end pieces interconnecting said top and bottom pieces in spacedrelationship to define an open frame structure,

(e) panel means closing the open area of said frame structure,

(f) a lamp means disposed within said fixture, said lamp means includinga lamp, and a wire lamp holder circumscribin g said lamp,

(g) and means for universally mounting said lamp means within said frameso as to adjust the directed beam of said lamp in any given direction,said universal mounting means including a slideway formed along each ofthe end pieces, a cooperating slide adjustably mounted in each slideway,and a resilient means supporting the lamp holder between said slides,

2. A cubic modular lighting fixture comprising,

(a) similarly constructed top and bottom frame pieces,

each having opposed frame members,

(b) end pieces interconnecting said top and bottom piece to define anopen cubical frame structure,

() each of said end pieces having a longitudinally extending grooveformed in the ends thereof,

((1) .panel means forming the sides of said modular retained in thegrooves between adjacent end pieces,

(e) means defining a slideway formed along the interior surface of eachend piece,

(f) a slide slidably mounted in the slideway of each end piece,

(g) a lamp disposed within said cubical frame structure, (h) and a lampsupport including resilient means connecting said lamp support to saidslides whereby the position of said lamp can be varied by adjusting theposition of respective slides along their respective slideway.

3. A modular lighting fixture comprising,

(a) a similarly constructed top and bottom member,

(b) each of said top and bottom members having connected opposed sideand end portions,

(0) end pieces connected between said top and bottom members to definethe corners of said modular fixture,

(d) each of said end pieces having a groove formed in the edges thereof,said groove extending the length of said end piece,

(e) a translucent panel for closing the open side area of said fixture,

(f) said panel having its opposed end portion received in the groovesformed in the opposed edge portion of adjacent end pieces,

(g) a lamp means disposed within said fixture,

(h) slider means movable along the end pieces for adjustably positioningof said lamp means in any of several positions within said fixture,means resiliently connecting said lamp means to said slider means,

(i) and means for positively maintaining the adjusted position of saidslider means and lamp means connected thereto.

4. A cubic modular lighting fixture comprising,

(a) a similarly constructed top and bottom members,

(b) each of said top and bottom members having opposed side and endportions of angular cross-section to define a rectangular frame havingan internal horizontal flange and a connected circumscribing verticallydisposed flange,

(c) extruded angled end pieces connected to and between the corners ofsaid top and bottom means to define the corners of said cubic modularfixture,

(d) each of said angled end pieces having a groove formed in the endedges thereof, said groove extend ing the length of said end piece,

(e) a translucent panel for closing an open side area of said fixture,

(f) said panel having its opposed end portion received in the groovesformed in the opposed facing edge portion of adjacent end pieces,

(g) a slideway formed along the inside of the respective flange portionof said end pieces,

(h) a slide adjustably mounted in the slideway of each corner piece,

(i) a lamp means disposed within said cubical fixture including arectangular lighting lamp and a wire holder therefor,

(j) resilient means for supporting said holder between said slides,

(k) and means for positively positioning the adjusted portion of saidlamp.

5. A luminary comprising,

(a) an elongated supporting column,

(b) a frame core disposed atop said column,

(c) and a plurality of cubic modular lighting fixtures clustered aboutsaid core in side by side relationship,

((1) each of said fixtures including,

(e) a top frame and a bottom frame, each defined by opposed side and endstructural angular members rectangularly disposed,

(f) a corner piece having flange portions interconnecting said top andbottom frames together to define a cubic frame structure having openfaces,

(g) each of said corner pieces having a longitudinally extending grooveformed in the edge portion of its respective flange portions,

(h) and each of said angular corner piece having a slideway formed atthe junction of its angled flange portion,

(i) a slide adjustably positioned in the slideway of the respectivecorner pieces,

(j) a lamp disposed with said cubical frame structure,

(k) means for supporting of said lamp to each of said slides,

(1) said latter means including a coil spring for suspending said la-mpfrom each of said slides,

(m) lock means for securing each of said respective slides in itsadjusted position,

(11) and translucent panels closing the exterior open side of saidcubical modular structure, the ends of said panels being received in theopposed grooves formed in the edges of adjacent corner pieces.

6. Aluminary comprising,

(a) an elongated supporting column of circular crosssection,

(b) a cubical frame core,

(c) means defining a transition frame connecting said frame core atopsaid column,

(d) and a plurality of cubical modular lighting fixtures clustered aboutsaid core and about each other, said fixtures being connected in side byside relationship,

(e) each of said fixtures including,

(f) a top frame defined by rectangularly disposed side and endstructural members of angled cross-section,

(g) a similar bottom frame defined by opposed side and end structuralangled members rectangularly disposed,

(h) a corner piece having right angled flange portions interconnectingsaid top and bottom frames together to define a cubical frame structurehaving open faces,

(i) each of said corner pieces having a longitudinally extending grooveformed in the edge portion of its respective flange portions,

(j) and each of said angled corner piece having a slideway formed at thejunction of its flanged portion, (k) a slide adjustably positioned alongthe slideway of the respective corner pieces,

(1) a rectangularly shaped fluorescent lamp disposed with said cubicalframe structure,

(in) a wire lamp holder circumscribing said lamp,

(11) means securing the corners of said lamp holder to each of saidslides,

(0) said latter means including a coil spring for suspending said lampholder and lamp supported thereon from each of said slides,

(p) lock means for securing each of said respective slides in itsadjusted position,

(q) said locking means including a set screw threaded through said slideto engage said corner piece for frictionally securing said slide inadjusted position.

(r) and translucent panels closing the exterior open side of saidcubical modular structure, the ends of said panels being received in theopposed grooves formed in the edges of adjacent corner pieces.

7. The invention as defined in claim 6 including,

References Cited by the Examiner UNITED STATES PATENTS 4/ 1911 Streiber24084 11/ 1922 Townsend 24090 Wakefield 2409 Guth 24078 Steifen 240-11.2

Goebel 2409 Belbes et a1 2403 Cutler et a1 24046.39

NORTON ANSI-IER, Primary Examiner.

3. A MODULAR LIGHTING FIXTURE COMPRISING, (A) A SIMILARLY CONSTRUCTEDTOP AND BOTTOM MEMBER, (B) EACH OF SAID TOP AND BOTTOM MEMBERS HAVINGCONNECTED OPPOSED SIDE AND END PORTIONS, (C) END PIECES CONNECTEDBETWEEN SAID TOP AND BOTTOM MEMBERS TO DEFINE THE CORNERS OF SAIDMODULAR FIXTURE, (D) EACH OF SAID END PIECES HAVING A GROOVE FORMED INTHE EDGES THEREOF, SAID GROOVE EXTENDING THE LENGTH OF SAID END PIECE,(E) A TRANSLUCENT PANEL FOR CLOSING THE OPEN SIDE AREA OF SAID FIXTURE,(F) SAID PANEL HAVING ITS OPPOSED END PORTION RECEIVED IN THE GROOVESFORMED IN THE OPPOSED EDGE PORTION OF ADJACENT END PIECES, (G) A LAMPMEANS DISPOSED WITHIN SAID FIXTURE, (H) SLIDER MEANS MOVABLE ALONG THEEND PIECES FOR ADJUSTABLY POSITIONING OF SAID LAMP MEANS IN ANY OFSEVERAL POSITIONS WITHIN SAID FIXTURE, MEANS RESILIENTLY CONNECTING SAIDLAMP MEANS TO SAID SLIDER MEANS, (I) AND MEANS FOR POSITIVELYMAINTAINING THE ADJUSTED POSITION OF SAID SLIDER MEANS AND LAMP MEANSCONNECTED THERETO.